20958469 has 4 divisors (see below), whose sum is σ = 23952544. Its totient is φ = 17964396.

The previous prime is 20958461. The next prime is 20958473. The reversal of 20958469 is 96485902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96485902 = 2 ⋅48242951.

It is a cyclic number.

It is not a de Polignac number, because 20958469 - 2³ = 20958461 is a prime.

It is a super-2 number, since 2×20958469² = 878514845647922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1497027 + ... + 1497040.

It is an arithmetic number, because the mean of its divisors is an integer number (5988136).

Almost surely, 2^20958469 is an apocalyptic number.

It is an amenable number.

20958469 is a deficient number, since it is larger than the sum of its proper divisors (2994075).

20958469 is an equidigital number, since it uses as much as digits as its factorization.

20958469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994074.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20958469 is about 4578.0420487366. The cubic root of 20958469 is about 275.7104231979.

The spelling of 20958469 in words is "twenty million, nine hundred fifty-eight thousand, four hundred sixty-nine".